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pwm: Clear chip_data in pwm_put()

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commit e926b12c61 upstream.

After a PWM is disposed by its user the per chip data becomes invalid.
Clear the data in common code instead of the device drivers to get
consistent behaviour. Before this patch only three of nine drivers
cleaned up here.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Uwe Kleine-König 2019-03-25 10:49:33 +01:00 committed by Greg Kroah-Hartman
parent a5ac276a5e
commit ae21311f81
4 changed files with 1 additions and 3 deletions
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1
drivers/pwm/core.c
View file

@ -874,6 +874,7 @@ void pwm_put(struct pwm_device *pwm)
if (pwm->chip->ops->free)
pwm->chip->ops->free(pwm->chip, pwm);
pwm_set_chip_data(pwm, NULL);
pwm->label = NULL;
module_put(pwm->chip->ops->owner);

1
drivers/pwm/pwm-berlin.c
View file

@ -78,7 +78,6 @@ static void berlin_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
{
struct berlin_pwm_channel *channel = pwm_get_chip_data(pwm);
pwm_set_chip_data(pwm, NULL);
kfree(channel);
}

1
drivers/pwm/pwm-pca9685.c
View file

@ -176,7 +176,6 @@ static void pca9685_pwm_gpio_free(struct gpio_chip *gpio, unsigned int offset)
pm_runtime_put(pca->chip.dev);
mutex_lock(&pca->lock);
pwm = &pca->chip.pwms[offset];
pwm_set_chip_data(pwm, NULL);
mutex_unlock(&pca->lock);
}

1
drivers/pwm/pwm-samsung.c
View file

@ -238,7 +238,6 @@ static int pwm_samsung_request(struct pwm_chip *chip, struct pwm_device *pwm)
static void pwm_samsung_free(struct pwm_chip *chip, struct pwm_device *pwm)
{
devm_kfree(chip->dev, pwm_get_chip_data(pwm));
pwm_set_chip_data(pwm, NULL);
}
static int pwm_samsung_enable(struct pwm_chip *chip, struct pwm_device *pwm)